Process for bending cast-iron.



LES.

NG- CAST ULY 25. 190

ATENTED JUNE 25, 1907.

IRON.

B. S. COW

PROCESS FOR BBNDI ATION FILED UNITED STATES PATENT OFFICE.

ASSIGNMENTS, TO THE NATIONAL ENGINEERING CO., OF NEW HAVEN,

CONNECTICUT, A CORPORATION.

, PROCESS-FOR BENDING CAST-IRON.

Specification of Letters Patent.

Patented June 25, 1907.

Application filed July 25, 1905- .Serial No. 271,155.

To all whom it may concern.-

Be it known that I, BURTON S. CowLEs, a citizen 'of the United States, residing at Plainville, Connecticut, have invented certain' new and useful Improvements in Processes for Bending Cast-Iron, of which the following is a clear, full, and exact description.

My invention relates to. a process of bending cast iron, and my object is to provide a process by which, for example cold gray cast iron, may be given a permanent bend without breaking.

My invention will be set forth in the claims.

The drawing shows a preferred form of machine for carrying out my process, in which Figure 1 is a side elevation and Fig. 2 an enlar ed section through the rolls.

It as been generally supposed heretofore that cold graycast iron could not be given a permanent bend without breaking, as the same is fragile, but I havediscovered that this may be done by suitably manipulating it, and I have carried out this process by treating pieces of cold graycast iron, by

which they were given a permanent bend out of their original cast-shape without removing any of the metal.

In carrying out the rocess I sup ort the cast iron upon a suitab e support or fiilcrum, such for example as the smooth faced roll 1 of the drawings, and apply pressure so closely adjacent to the point of support as to give a permanent bend to the iron without breaking. This bending pressure is exerted, as seen in Fig. 2, by projections 3, 4, etc. u on the face v of the roll 2, and by rotating t e roll 2 by means of the crank 5 the rod is passed through the rolls. At. the point where the rolls approach closest together, as at 6 in Fig. 2, the rod is held firmly pressed between the rolls, and as the projections 3, 4, etc. meet the rod they bend it downward. Obviously as the upper roll is rotated the compression at the point 6,'as well as the bending pressures exerted by the projections, move along the strip of iron without any of the pressures being relieved.

In a machine which I-have used successfully in carrying out my process, the diameter of the smooth faced roll 1 was about two inches, the diameter of the roll 2 one inch,

and the roll 2 was milled or knurled so as to be covered with diamond-shaped pyramidal projections about 190 to the square inch. The roll 2 is mounted in sliding journal blocks 7, 7, upon which press the screws 8, 8, soas to exert the desired pressure. I have, with perfect success, given a permanent bend to gray cast iron piston rings of one-quarter inch cross sectional width, and also to heavier rings.

The steps of the operation would seem to be as follows:The metal is clamped at a point between two rolls indicated by the arrow 6 in Fig. 2. In advance of this point the tips of the projections 3, 4, &c., of the knurled roll comes in contact with the surface of thebar and forces it downward before it reaches the su orting roll, thus giving it a slight bend, an moves along to tions become em edded in the surface expanding it, and'holding it while the pressure condenses the metal around said projections thus fixing the bond as permanent. In other words, the bending, expanding and condensmg of the metal at any particular point have ta en place at the time said part passes point 6.

What I claim is:

olding said bend until it oint 6 where said projec- 1. The process of bendingcast iron, consisting in su porting the iron upon a suitable fulcrum un er pressure and applying downward pressure to one side of the iron at a plurality of points transverse to the line of movement of the iron and closely adjacent to the point of support, thereby expanding said sur ace without changing the length of the opposite side, substantlally as described.

2. The process of bending cast iron, consisting in continuously passing the piece to be bent between two rolls, one of which is knurled, the metal having no other support, and successively applying pressure on one face thereof at separate points on a line parallel with the axis of said rolls and closely adj acent to line of support, thereby elongating said face without changing the finish or length of the opposite face.

3. The process of bending cold gray cast iron, consisting insupporting the piece to be bent upon a fulcrum and simultaneously applying downward pressure thereon at a plurality of points on two parallel lines adjacent to the fulcrum, thereby bending the piece iece and fixing said bend, by elongating said and fixing said bend by swaging, or eXpand- 106 Without changing the condition, finish or in said side While maintaining the op osite length of the opposite face, substantially as side unchanged as to condition, finis and described. 5 length. Signed at New Haven, Conn., this 21st day I 5 4. The process of bending cold gray cast of July 1905. iron, consisting in supporting the piece on a BURTON S. COWLES.

at a plurality of points adja- S. E. MERRIAM,

fulcrum and applying downward pressure on Witnesses: one face thereo 10 cent to said fulcrum, thereby bending said M. A. MERRIAM. 

